Temperatures begin to moderate but tropical storms and typhoons can still occur, particularly in southern and coastal regions. Travel can be disrupted by severe weather; inland and northern areas often become more comfortable as the month progresses.
Average daily low and high (°C) and monthly rainfall. The badge shows how it feels, allowing for humidity.
Average temperature across Japan in September.
Sapporo, Niseko, Furano, Asahikawa
Early autumn color starts in high country in September, with crisp mornings and cooling nights around Asahikawa and the Daisetsuzan range. The sea temps still hold warmth, so coastal drives remain pleasant and fewer tourists make it easier to find lodging. Keep an eye on weather for sudden rain; September can be a transition month with both stable sunny days and autumnal storms.
Aomori, Akita, Sendai, Niigata, Kanazawa
September is the month typhoons often affect the region: heavy rain and flooding are possible, especially in river valleys and low-lying coastal towns. Mountain trails can be slippery and landslide risk rises after prolonged storms, so check local advisories. If the weather is calm, early autumn colors begin to paint higher slopes by the month’s end.
Tokyo, Yokohama, Kamakura, Mt. Fuji approaches
September’s early weeks often bring typhoons and intermittent heavy rain; when the storms pass, cooler, clearer days arrive and humidity drops. This month can be chaotic for transport during major storms, so monitor forecasts. Later in September you’ll find more comfortable sightseeing weather and thinning domestic crowds.
Nagano, Matsumoto, Takayama, Kamikochi, Mt. Fuji approaches
September gives cooler mornings and often excellent visibility for summit views; early autumn color starts on higher slopes by late month. Typhoon-induced heavy rain is a hazard in wetter years and can close alpine passes and trails for safety. This is a crisp and photogenic shoulder season for hikers who avoid mid-summer crowds.
Kyoto, Osaka, Nara, Hiroshima, Okayama, Takamatsu
September starts with lingering heat and a high chance of typhoon-related rain-storms can close ferries and disrupt schedules. As the month progresses, humidity drops and clearer, cooler days arrive. Autumn festivals and harvest foods make travel satisfying, but maintain flexible plans for potential storm impacts.
Fukuoka, Nagasaki, Kumamoto, Kagoshima, Yakushima, Okinawa main and outlying islands
September often feels like an extension of summer early on, but typhoons reach peak frequency this month and can bring heavy rain, flooding and ferry/flight cancellations. If the weather is calm, lower crowds and warm sea temperatures make snorkeling and coastal drives rewarding. Travelers should insure plans and monitor local weather updates.
There are no major festivals or events in Japan during September to be aware of.
See how September compares with the rest of the year, then read the full guide.